Improvement in claw-bars



A. SHAW.

Claw-Bar.

No.l66,818, PatentedAug 17,l87 5.

INVENTDB ",PETERS. FHOTO-LXTHOGRAPHER, WASHINGTON, o c.

UNITED STATES PATENT QFFIC.

ANDREWV SHAW, OF PETROLEUM, WEST VIRGINIA.

IMPROVEMENT IN CLAW-BARS.

Specification forming part of Letters Patent No. 166,8 [8, dated August17, 1875; application filed J une 26, 1875.

To all whom it may concern:

Be it known that 1, ANDREW SHAW, of Petroleum, in the county of Ritchieand State of West Virginia, have invented a new and useful Improvementin Claw-Bars, of which the following is a specification:

Theobject of this invention is to provide a bar for drawing spikes fromrailroad-ties, and for drawing spikes or nails in other places, thatwill allow the clutch-jaw to be raised and the leverage obtained,diminished after the spike has been partly drawn, so as to draw thespike clear out.

In the accompanying drawing, Figure 1 is a sectional side view of thedraw-bar. Fig. 2 is a top view.

Similar letters of reference indicate corresponding parts.

This bar is made in two main parts, the lever and the clutch-bar. A isthe lever, and B is the clutch-bar. The lever A is slotted, and theshank of the clutch-bar is let into the slot, as seen in Fig. 2, andfitted to the head of the lever. O is the fulcrum of the drawbar, beinga portion of the lever A. The two parts are confined together by the pinD. E is a spring in a recess opposite the fulcrum 0, to throw the clutchup. F is a springbolt, which is operated by means of a lever and triggerin the lever. In the end of the shank of the clutch are a series ofteeth, H, which the spring-bolt F enters, and by which the shank is.fastened downward, as represented in dotted lines, which throw theclutch end I upward. The clutch-barB turns on the pin D in this case,and the pin D becomes the scribed.

raised from the head of the lever so that the pin D takes the strain orresistance while 0 remains the fulcrum of the lever. The springbolt ispressed constantly downward, and drawn back by the spring. I is thelever, whose fulcrum is at H. G is a trigger for operating the lever.

In drawing a spike the main force must be exerted on the starting of thespike when the draw-bar is in the first position. When the clutch-bar ischanged the strain required is much less on the clutch-bar, and,consequently, the fulcrum-pin D is sufficient for the purpose.

Having thus described myinvention,I claim as new and desire to secure byLetters Patent-- The combination, with the lever A and clutch-bar B,having teeth H, of the spring trip-bolt F, substantially as shown andde- ANDREW SHAW.

Witnesses:

G. W. GENDLEY, J No. W. OHIsHoLM.

